Asymmetric Synthesis of Bicyclic Ketones Having an Angular Substituent via Ti(II) Alkoxide-Mediated Tandem Cyclization of Trisubstituted Olefinic Substrates
作者:Hirokazu Urabe、Daigaku Hideura、Fumie Sato
DOI:10.1021/ol9904038
日期:2000.2.1
[reaction: see text] Angularly substituted, optically active bicyclic ketones of up to 94% ee were prepared by the Ti(II) alkoxide-mediated tandem cyclization of open-chain substrates, that is, 8-phenylmenthyl enynoates having a trisubstituted double bond.
Preparation of polyfunctional nitro olefins and nitroalkanes using the copper-zinc reagents RCu(CN)ZnI
作者:Carole Jubert、Paul Knochel
DOI:10.1021/jo00046a027
日期:1992.9
The addition of the copper-zinc reagents RCu(CN)ZnX to a variety of nitro olefins produces polyfunctional nitroalkanes in high yields. The intermediate zinc or copper nitronates can be directly submitted to a Nef reaction (O3,-78-degrees-C) and converted to polyfunctional ketones in a one-pot procedure. The addition of RCu(CN)ZnX to nitro olefins bearing a leaving group (RSO2, RS) in the beta-position provides pure (E)-nitro olefins in excellent yields. The reaction has been applied for the stereoselective preparation of 1,3-nitrodienes and for a Diels-Alder reaction precursor.
806. Syntheses of long-chain acids. Part VII. Preparation and reduction of some alkadiynoic acids
作者:D. E. Ames、A. N. Covell、T. G. Goodburn
DOI:10.1039/jr9650004373
日期:——
Jindal, Rani; Devi, Aarti; Kad, Goverdhan L., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2010, vol. 49, # 4, p. 495 - 499